In the Layers palette, click on the Background layer to activate it, and then from the Edit menu, choose Define Brush Preset. Name your new brush and click OK. Press Command-D (PC: Control-D) to Deselect.
Tip
Once you’ve defi ned some custom brushes, it’s a good idea to create a backup version so you don’t lose these brushes. To do this, use Edit>Preset Manager and choose Brushes from the Preset Type pop-up menu. While pressing-and-holding the Command key (PC: Control key), click on each of your custom brushes until you have them all selected. fien click Save Set and, in the Save dialog, save your brushes in a safe place. If you want your brush set to automatically appear in the Brushes palette, save your brushes in Hard Drive:Applications:Adobe Photoshop CS2:Presets:Brushes on a Mac or in C:Program FilesAdobeAdobe Photoshop CS2PresetsBrushes in Windows.